P0431
Catalyst 1 Efficiency Below Threshold Bank 2
P0431 is an OBD-II diagnostic trouble code meaning: Catalyst 1 Efficiency Below Threshold Bank 2. Common causes: worn or damaged catalytic converter, malfunction of oxygen sensors. Estimated repair cost: $167–556.
Symptoms
- Increased fuel consumption
- Reduced engine power
- Unusual exhaust smell
- Check Engine Light Is On
Causes
- Worn or damaged catalytic converter
- Malfunction of oxygen sensors
- Misfires
- Exhaust leaks
- Use of low-quality fuel
How to Fix
- Check the condition of the catalytic converter
- Check the operation of oxygen sensors
- Eliminate misfires
- Check the exhaust system for leaks
- Replace the catalytic converter if necessary
Related codes
Error P0431 by Vehicle Brand
FAQ
What does the P0431 code mean?
P0431 is an OBD-II diagnostic trouble code that indicates: Catalyst 1 Efficiency Below Threshold Bank 2
What causes a P0431 error code?
The most common causes of P0431 include: Worn or damaged catalytic converter; Malfunction of oxygen sensors; Misfires; Exhaust leaks.
How do I fix a P0431 diagnostic trouble code?
To fix P0431: Check the condition of the catalytic converter. Check the operation of oxygen sensors. Eliminate misfires. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0431?
Limited driving only, diagnose soon
How much does it cost to fix P0431?
The estimated repair cost for P0431 is $167–556. Actual cost depends on your vehicle, location, and labor rates.
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